GitLab

ash/shell.h is referred in the file, but it turns out unnecessary.
Simply removing the include is just fine.

TBR=stevenjb@chromium.org

Bug: 646565
Test: build succeeds
Change-Id: Ic0709c0bcb4a01b5fd2744ad89fb53c0936b2088
Reviewed-on: https://chromium-review.googlesource.com/1148931
Commit-Queue: Jun Mukai <mukai@chromium.org>
Reviewed-by: Shu Chen <shuchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578902}